I once really scared myself diving solo just 2 decks below the main deck of the Spiegel Grove when I could not find my overhead hatch to the decks above.../ /...I remained calm, turned off my light, and saw pale blue at the end of the long corridor...
This example does an excellent job of illustrating how deceptive going into an overhead can be. Consider that had the visibility been a little lower, had the he stirred up silt on the way in, or had he not had the presence of mind to stop before he made a bad situation worse, or had he not though to turn off his light, he'd have died there.
It's a common practice to prepare artificial reefs so that untrained divers can penetrate the wreck with a reduced chance of kacking themselves. However, it will be interesting to see how well that works 20-30 years down the road when many of those same wrecks eventually become silt filled.
It's entirely possible to swim 10 feet into a three sided compartment with a couple hatches in the sides and stir up enough silt that you can't find your way out the open side. A rebreather diver posted his experience with that here several years ago and made it clear that had he not been on a rebreather, with the time to wait for it to clear, and the lack of bubbles needed for it to clear, he'd have never found his way out of the side compartment he'd ended up in.
If you look around you'll find examples in comparatively open wrecks where a pair of divers are swimming through the wreck, the lead diver has a problem and blows the viz, but when they turn around they discover the viz behind them is blown too.
My pet peeve however is that the dive industry works over time to make diving appear to be safe, but does so at the expense of explaining to divers the risks involved and the clearly illustrating the differences and the difference in risk levels between a short swim through in a very open and silt free wreck where you can always see a way out, and a wreck where those critical life and death conditions are not met.
Spoolin seems to be running for poster boy for that very ill conceived market driven approach. Personally it's an industry practice that I think borders on criminal negligence.